Collapsible exercise frame



FIG. 1 is a front, right perspective view of a collapsible exercise frame showing my new design;

FIG. 2 is a front perspective view thereof;

FIG. 3 is a side perspective view thereof;

FIG. 4 is a top plan view thereof; and,

FIG. 5 is a bottom plan view thereof.

The broken lines form no part of the claimed design. 

CLAIM The ornamental design for a collapsible exercise frame, as shown and described. 